C :: Swapping Like Function

I have a question about one function in my program. Write a function that will replace players in a tim. New player gets in the game, and takes the place of one that leaves. Prototype of function is:

Code:

void replace(TEAM *p,PLAYER newplayer,int num)

where second parameter is new player, and the third is a jersey number of player who leaves the game.Two structures are defined as:

Code:

typedef struct{ char name[25],surname[25];int number;}PLAYER;typedef struct{ char nameofteam[25];int numberofplayers;PLAYER *players;}TEAM;

First I tried to read which player should get out, but that didnt work:

Code:

printf("which player should get out?
"); do { scanf("%s",p->players.number) } while(p->players.number);//

Choose one of previously read players Second thing is to read a new player and replace him with the chosen who leaves.